Dumb-waiter or lift.



S. MQOAMEY & W. J. ZIMMERMAN.

DUMB WAITER 0R LIFT.

APPLICATION FILED SEPT. 10, 1909.

Patented Jan. 11, 1910.

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DUMB WAITER OR LIFT.

APPLICATION FILED 8EPT.10, 1909.

Patented Jan. 11, 1910.

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SIMPSON McCAMEY AND WILLIAM J. ZIMMERMAN, OF PORTLAND, OREGON.

DUMB-WAITER OR LIFT.

Specification of Letters Patent.

Patented J an. 11, l ifi.

Application filed September 10, 1909. Serial No. 517,142.

To all whom it may concern:

Be it known that we, SIMrsoN HOCAMEY and VVILLIAM J. ZIMMERMAN, both of Portland, Oregon, have invented a new and useful Improvement in Dumb -lVaiters or Lifts, of which the following is a specification, reference being had to the accompanying drawings as constituting a part thereof.

This invention has for its object to obtain a motor mechanism, to be used for lifting and lowering a dumb waiter, or similar device, which comprises a friction gearing, and simple, but effective, means by which the driving member of the gearing can be thrown into and out of contact with the driven member; and to this end our invention includes the specified devices and combination of parts hereinafter more fully set forth.

In the drawings: Figure 1 is a front elevation of our dumb waiter, and its motor,

arranged in its simplest form; Fig. 2 is a plan or top View illustrating the arrangement of the friction gears revolving the drum on which the cable winds; Fig. 3 is a front elevation showing our device arranged to operate two independent dumb waiters, and embodying a modified arrangement of the friction gears so as to be able to revolve the winding drum for the cable of either dumb waiter, independently, and at will; Fig. 4 is a plan or top view of the cable winding device, corresponding with Fig. 3; Fig. 5 is a perspective detail of one of the boxes in which the shaft ends of one member of the friction gearing are journaled; Fig. 6 is a perspective detail of the pinion mounted on the shaft ends of the movable member of the friction gears, also, illustrating the means for affixing a lever on such pinion for the purpose of partially rotating the same, as more fully explained in the body of this specification; and Fig. 7 is a perspective detail of a brake shoe for controlling the revolution of the drum.

Referring in the first instance to the construction illustrated in Figs. 1 and 2: The supporting frame a, may be constructed of angle iron, in any convenient form, and thereon are mounted boxes 6, b, in which are journaled the ends of the shaft 0, on one outer end of which shaft is mounted a belt pulley (l, and on the other end thereof is mounted a friction pulley 6, having a paper -friction mm, as common 1n construction of like devices. Fixed parallel to the boxes Z), 6, are boxes f, f. A large perspective detail of the latter is shown in Fig. 5, and the same comprises a longitudinally elongated bearing aperture or slot 9, in which the ends of the shaft h are inserted. On both ends of the shaft h are mounted pinions, 2', provided with a segment of teeth, 7', and, since the function of these pinions is to partially rotate the shaft h, we will hereafter, in this specification, designate the same as positioners A simple means for rigidly securing the positioners 2' on the shaft h are set screws 70, as we have shown in Fig. 6. One of the positioners i, must be provided with a recessed or grooved face 5, or equivalent means by which to rigidly fasten a lever m. Ne secure the latter in place bv the screw 11., as shown by the details illustrated in Fig. 6. In practice, however, it is convenient to make both of the positioners 2' with a grooved face, Z, so that they are interchangeable, in case that one thereof. to which lever m, is affixed, should become broken in service and be incapable of further use to hold said lever m rigidly in place. The same construction, of course, also simplifies the number of parts required in the setting up of our dumb waiter. To cooperate with the positioners 2' and enable the same to perform their function, the boxes f are provided with laterally projected rack-faced ledges 0. On such rack-faced ledges the positioners 2' rest, and the parts are so arranged that when the lever m is down the ends of the shaft 71 will be positioned at the left extremities of the bearing slots g, and by the lifting of the lever m, the positioners z' are caused to roll the shaft it toward the right extremities of the bearing slots 9 of the boxes f, and, in so doing, bringing the friction gear 79 into operative contact with the friction pinion c.

On the shaft 71 is loosely mounted a flanged drum, 9, on which is secured one end of, and winds, the rope 1, running over sheaves s, 8, located as convenient; and the opposite end of said rope being fastened to the dumb waiter t, or other device to be raised and lowered in the guide-frame u. The drum, is either bolted to the friction gear, 79, or integrally cast therewith, so that the rotation of the latter will revolve the former.

To render the operation ofthe lever m convenient, we connect thereto the rope, o, guided over sheaves 'w, w, and fastened to to the operating lever 00; the parts being so arranged that the pulling down of the operating lever 00 will lift the lever m, and in so doing rotate the positioners 2' as already described. To automatically return the lever m to its normal position, we provide a coil spring 1 and the latter also performs the function of applying at the proper time, the brake element of our invention. The latter consists of the shoe 2, a detail of which is more clearly shown in Fig. 7; it has a con caved face a so as to be adapted to have a sufficient braking contact with the rim of the friction gear, 79, and it is provided with a member 2 adapted to be bolted to one of the cross beams of the supporting frame a. Thus, normally, the rim of the friction gear p is held in braking contact with the brakeshoe 2, and it will be noted from the construction described and illustrated, that, in order to interrupt such braking contact of the parts referred to, it is necessary to depress the operating-lever, as, and in this way we incidentally insure the safety of our device. In other words, the moment the operator releases the operating lever w, the spring so doing, throw the friction gear 7 against the brake-shoe a, and thus prevent the rope 1" from being unduly unwound from the drum 9. At the same time the operator, by slightly pulling down the lever 01, may interrupt the contact of the friction gear with the brake shoe to such extent as to permit the friction gear 79 to revolve at a convenient speed for lowering the dumb waiter, 11.

In practice, the space between the friction pinion, e and the friction gear 72 would not be more than about an inch, or less.

The modified arrangement of our device illustrated in Figs. 8 and t is very much the same as above described except in the following particulars: The object of this arrangement is to enable us to operate independently, with the same motor power, two dumb waiters 2, 2 The belt-pulley 3, is mounted on the shaft at, journaled in boxes 5, mounted on the frame, 6. On either side of the boxes 5 are mounted boxes 7, 7, respectively provided with elongated bearing slots and with laterally projecting rack-faced ledges as illustrated in Fig. 5. In the boxes 7, 7 are journaled the ends of shafts 9, 10, on the extremities of which are rigidly mounted positioners 11, of the same construction as the positioners 2' above described, and shown in Fig. 6. On each of the near positioners 11 is rigidly mounted a lever, 12, 12, and on each of the shafts, 9, 10 is mounted a drum 13, let, rigidly connected to, or an integral part of the friction gears 15, 16 which are adapted to have operative contact with the friction pinion 17, rigidly mounted on the shaft 4. On the drums 18, 14 wind, independently, ropes 18, 19. The levers, 12, 12

20, 21, and the levers 12, 12 are connected by ropes 22, 23, with the operating levers, 24, 25. 26 and 27 are brake-shoes performii'ig the same function as the brake-shoe .2 in the first described example of our device. 13y operating the operating levers, 2d, 25, the friction gears, 15, 16 may be caused to have operative contact with the friction pulley, 17, independently, also simultaneously, for operating either of the dumb-waiters, 2, 2 or operating both of them at the same time. The principles of construction illustrated by us in Figs. 3 and 1 may, obviously, be further extended to operate three or four dumb waiters at the same time. The object in view in the modified arran ement of our device was to use a single unit of driving power for operating a plurality of dumb waiters.

In the foregoing description, as well as in the drawings of our device, we have shown the parts so arranged as to include means for laterally moving the shaft of the friction gear into and out of engagement with the friction pulley. e do not, however, wish y will act to pull down the lever m, and in to be expected to confine ourselves exclusively to such particular arrangen'ient of the cooperative parts; for, as is obvious to every mechanic, the same means provided by us for laterally moving the shafts of the fric tion gears could be equally well applied for moving the shaft of the friction pulley, under circumstances where only a single dumb waiter is to be operated; but we consider the specific arrangement of parts as illustrated by us, as the more convenient for general use and all conditions.

We claim:

1. In a power transmission mechanism, the combination of, a shaft and bearings therefor, a parallel shaft and bearings therefor, the bearings of one shaft being fixed and those of the other including means permitting a longitudinal movement of such shaft toward and from the other; a. pinion fast on one shaft; a drum loose on the other shaft, a gear on one end of said drum, rackfaced ledges along the slots of both of the bearings of the movable shaft, pinions or positioners rigid on both ends of the movable shaft, said positioners provided with peripheral toothed segments resting on said rack-faced ledges of the bearings of the movable shaft; means including a lever for rotating the positioners, a spring arranged to normally position the lever so as to break the operative contact between said pinion and gear; and a brake element arranged to have contact with the periphery of the gear when the same is out of contact with said pinion.

2. In a power transmission mechanism, the combination of, a shaft and bearings therefor, a parallel shaft and bearings thereare held in their normal position by springs i for, the bearings of one shaft being fixed and those of the other including means permitting a longitudinal movement of such shaft toward and from the other; a pinion fast on one shaft, a drum loose on the other shaft, a gear on one end of said drum, rack-faced ledges located along the slots of both of the bearings of the movable shaft, pinions or positioners rigid on both ends of the movable shaft, said positioners provided with peripheral toothed segments resting on said rack-faced ledges of the bearings of the movable shaft; a lever projecting from one of the positioners, a spring arranged to normally position the lever so as to break the operative contact between said pinion and gear; and a brake element arranged to have contact with the periphery of the gear when the same is out of contact with said pinion.

3. In a power transmission mechanism, the combination of, a shaft and bearings therefor, a parallel shaft and bearings therefor, the bearings of one shaft being fixed and those of the other including means permitting a longitudinal movement of such shaft toward and from the other; a pinion fast on one shaft, a drum loose on the other shaft, a gear on one end of said drum, rackfaced ledges located along the slots of both of the bearings of the movable shaft, pinions or positioners rigid on both ends of the movable shaft, said positioners provided with peripheral toothed segments resting on said rack-faced ledges of the bearings of the movable shaft; a lever projecting from one of the positioners; the face of the positioner to which said lever is afiixed, being recessed to securely hold the latter in place, a spring arranged to normally position the lever so as to break the operative contact between said pinion and gear; and a brake element arranged to have contact with the periphery of the gear when the same is out of contact with said pinion.

4. In a power transmission mechanism, the combination of, a shaft and bearings therefor, a parallel shaft and bearings therefor, the bearings of one shaft being fixed and those of the other including means per mitting a longitudinal movement of such shaft toward and from the other; a pinion fast on one shaft, a drum loose on the other shaft, a gear on one end of said drum, rackfaced ledges located along the slots of both of the bearings of the movable shaft; pinions or positioners rigid on both ends of the movable shaft, said positioners provided with peripheral toothed segments resting on said rack-faced ledges of the bearings of the movable shaft; means including a lever for rotating the positioners, a spring arranged &

to normally position the lever so as to break the operative contact between said pinion and gear; a brake element arranged to have contact with the periphery of the gear when the same is out of contact with said pinion, and an operating member and connections therefrom to the lever.

5. In a power transmission mechanism, the combination of, a central shaft and fixed bearings thereon, a driving pinion fastened on the central shaft, a parallel shaft on either side of said central shaft and bearings for said parallel shafts, the bearings for said shafts being adapted to permit a longitudinal movement of the lattertoward and from the central shaft; drums loose on each of said parallel shafts, gears on one end of each of said drums, rack-faced ledges located along the slots of both of the bearings of the movable shafts, pinions or positioners rigid on both ends of said movable shafts, said positioners provided with peripheral toothed segments resting on said rack-faced ledges of said bearings, means for independently rotating the positioners, including a spring element arranged to normally break the operative contact between said pinion and gear; and a brake element arranged to have contact with the periphery of the gear when the same is out of contact with said pinion.

6. In a power transmission mechanism, the combination of, a central shaft and fixed bearings thereon, a driving pinion fastened on the central shaft, a parallel shaft on either side of said central shaft and bearings for said parallel shafts, said bearings including elongated slots permitting a longitudinally bearing movement of said parallel shafts toward and from the central shaft; drums loose on each of said parallel shafts, gears on one end of each of said drums, rackfaced ledges located along the slots of both of the bearings of the movable shafts, pinions or positioners rigid on both ends of said movable shafts, said positioners provided with peripheral toothed segments resting on said rackfaced ledges of said bearings; means for independently rotating the positioners, including a spring element arranged to normally break the operative contact between said pinion and gear; and a brake element arranged to have contact with the periphery of the gear when the same is out of contact with said inion.

SIMPSON MoOAMEY. WILLIAM J. ZIMMERMAN. WVitnesses ELLA J. HAYS, O. O. MARTIN. 

